Looks like Tion Green has bypassed Zenner on the depth chart.
rookie Tion Green, he of the 2,072 yards TOTAL rushing in college at "powerhouse" Cincinnati (in five seasons, actually, due to a medical redshirt), is apparently ahead of ZZTops on depth chart for the Lions ... Zenner, for reference, rushed for over 2,000 yards in THREE SEPARATE SEASONS whilst in college.
Green's official NFL.com scouting report says:
Production has been below average in college. Lacks explosiveness. Playing style lends itself to a grinder mentality. Lacks the functional speed to consistently beat flowing linebackers around the corner. Face-up runner with difficulties getting skinny through tight quarters. Decisiveness and pace of his runs will both have to accelerate. Premature finisher who looks to cover and duck his helmet rather than seek out additional moves on second level. Runs between tackles like he's afraid to fumble.
it's obvious that the Detoilet Lions don't view Zenner as a piece of their future plans.